LKFCXDN/LH – Sun Hydraulics Pilot-to-open, spring-biased closed, unbalanced poppet logic element, Mild Steel, Zinc-Nickel

LKFC-XDN Sun Hydraulics Logic Element Valve – installation dimensions drawing, cavity T-2A
LKFC-XDN Sun Hydraulics Logic Element Valve – hydraulic schematic symbol
LKFC-XDN Sun Hydraulics Logic Element Valve – hydraulic schematic symbol
LKFC-XDN Sun Hydraulics Logic Element Valve – hydraulic schematic symbol
LKFC-XDN Sun Hydraulics Logic Element Valve – performance curve (pressure drop vs flow)
LKFC-XDN Sun Hydraulics Logic Element Valve – performance curve (pressure drop vs flow)
LKFCXDN Sun Hydraulics Logic Element Valve – 2D outline drawing
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Part number: LKFCXDN · LKFC-XDN · LKFC XDN

Brand Sun HydraulicsType Logic ElementCapacity 30 gpm (120 L/min.)Cavity T-2A

Pilot-to-open, spring-biased closed, unbalanced poppet logic element. Cavity T-2A, capacity 30 gpm (120 L/min.). Genuine Sun Hydraulics cartridge — MultiFlow is an authorized distributor.

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SKU: LKFC Category: Brand:

LKFC-XDN overview

LKFCXDN (LKFC-XDN, LKFC XDN) is a Sun Hydraulics Sun Hydraulics Pilot-to-open, spring-biased closed, unbalanced poppet logic element, rated 30 gpm (120 L/min.) and installed in cavity T-2A. MultiFlow supplies genuine Sun Hydraulics cartridges in the UAE, GCC and India — use Add to Enquiry above for availability and a quotation.

Ordering codes

Pick the code that matches the material and finish you need. Add it to your enquiry above, or tap a code to select it.

LKFCXDN/AP Stainless Steel, PassivatedStainless Steel, Passivated
LKFCXDN/LH Mild Steel, Zinc-NickelMild Steel, Zinc-Nickel
LKFCXDN Standard Material/CoatingStandard Material/Coating

Specifications

CavityT-2A
Series2
Capacity30 gpm (120 L/min.)
Maximum Operating Pressure5000 psi (350 bar)
Maximum Valve Leakage at 110 SUS (24 cSt)10 drops/min.@1000 psi (0,7 cc/min.@70 bar)
Pilot Volume Displacement.06 in³ (0,98 cc)
Pilot Passage into Valve.035 in. (0,9 mm)
Area Ratio, A3 to A11.8:1
Area Ratio, A3 to A22.25:1
Valve Hex Size1 1/8 in. (28,6 mm)
Valve Installation Torque45 - 50 lbf ft (61 - 68 Nm)
Seal kit - CartridgeViton: 990202006

How to read LKFCXDN

Sun part numbers are the model followed by one code per option. Hyphens, slashes and spaces are only dividers, so LKFCXDN, LKFC-XDN, LKFC XDN are the same part.

ModelLKFC — Sun Hydraulics Pilot-to-open, spring-biased closed, unbalanced poppet logic element
ControlX — Not Adjustable
Minimum Pilot PressureD — 50 psi (3,5 bar)
Seal MaterialN — Buna-N
Material / coatingAdd /AP (stainless steel, passivated) or /LH (mild steel, zinc-nickel) to the end; no suffix is the standard finish.
Control options
  • X — Not Adjustable
  • E — External 4-SAE Pilot Port, Port 3 Blocked
  • L — Manual Override
  • P — External 1/4 NPTF Pilot Port, Port 3 Blocked
Minimum Pilot Pressure options
  • D — 50 psi (3,5 bar)
Seal Material options
  • N — Buna-N
  • V — Viton
  • E — EPDM
Material/coating options
  • /AP — Stainless Steel, Passivated
  • /LH — Mild Steel, Zinc-Nickel
  • — Standard Material/Coating

Manifold & standard assemblies

Sun manifolds for cavity T-2A (544)

View all 544 →

Technical features

  • These valves have positive seals between port 2 and the pilot area.
  • Cartridges configured with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage the seals.
  • Because these valves are unbalanced, operation is pressure dependent. Opening and closing of the poppet are functions of the force balances on three areas: Port 1 = 100%, Port 2 = 80%, and the Pilot Area = 180%.
  • These valves are pressure responsive at all ports, therefore it is essential to consider all aspects of system operation through a complete cycle. Pressure changes at any one port may cause a valve to switch from a closed to an open position, or vice versa. All possible pressure changes in the complete circuit must be considered to assure a safe, functional system design.
  • All ports will accept 5000 psi (350 bar).
  • Corrosion resistant cartridge valves are intended for use in corrosive environments and are identified by the model code suffix /AP for external stainless steel components, or /LH for external zinc-nickel plated components. See the CONFIGURATION section for all options. For further details, please see the Materials of Construction page located under TECH RESOURCES.
  • Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations.

Drawings, symbol & performance curves

LKFC-XDN Sun Hydraulics Logic Element Valve – hydraulic schematic symbol
hydraulic schematic symbol
LKFC-XDN Sun Hydraulics Logic Element Valve – hydraulic schematic symbol
hydraulic schematic symbol
LKFC-XDN Sun Hydraulics Logic Element Valve – hydraulic schematic symbol
hydraulic schematic symbol
LKFC-XDN Sun Hydraulics Logic Element Valve – performance curve (pressure drop vs flow)
performance curve (pressure drop vs flow)
LKFC-XDN Sun Hydraulics Logic Element Valve – performance curve (pressure drop vs flow)
performance curve (pressure drop vs flow)
LKFCXDN Sun Hydraulics Logic Element Valve – 2D outline drawing
2D outline drawing

Downloads

Datasheet

Technical reference sheets

CAD files

Frequently asked questions

Is LKFCXDN the same as LKFC-XDN?

Yes. Sun Hydraulics writes this part number as LKFCXDN. It is the model LKFC followed by the configuration code; hyphens, slashes and spaces are only dividers, so LKFCXDN, LKFC-XDN, LKFC XDN all refer to the same product.

Do you supply LKFCXDN in the UAE, GCC and India?

Yes. MultiFlow supplies genuine Sun Hydraulics cartridges, including LKFCXDN, to customers in the UAE, the wider GCC and India. Use Add to Enquiry on this page for availability, lead time and a quotation.

Can I get the datasheet and CAD files?

Yes. The datasheet, technical reference sheets and CAD files (DXF, DWG, STP) are listed in the Downloads section of this page.

I need to discharge a large accumulator. How can I increase the capacity of my discharge circuit?

Because of the very high ratio, the COFO has limited capacity. The discharge path is across a .050 inch (1,3 mm) diameter orifice. If you have large accumulators combined with low precharge pressures, this may not discharge the energy quickly enough. Using the COFO XDN cartridge in conjunction with an LODA XDN will provide capacity for larger applications.

How big is a drop of hydraulic oil?  

There are exactly 250 Sun drops in a cubic inch or 15 in a cc.

Direct acting or pilot operated - what do I use?

Direct-acting valves are used to prevent over pressure, and pilot-operated valves are used to regulate pressure. If you are unsure, use a direct-acting valve. Sun's direct acting valves are very fast, dirt tolerant, stable, and robust. Sun's pilot-operated valves are moderately fast, they have a low pressure rise vs. flow curve, and they are easy to adjust.

What parts of the Sun cartridge valve are field serviceable?
Only external seals are serviceable.  Sun offers replacement seal kits for all cartridge models. The applicable kit part number can be found in the product page's Technical Data table or by using our Cartridge Seal Kit search function located under Accessories. Please note: Converting the external seals from one material to another does not ensure fluid compatibility with that material due to the existence of internal seals within the cartridge.

Manufacturer reference: https://www.sunhydraulics.com/model/LKFC

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